What is the queen of unicorns?

Could you please elaborate on the term "queen of unicorns"? It sounds intriguing, but I'm not quite sure what it refers to in the context of cryptocurrency and finance. Is it a specific cryptocurrency project? Or perhaps a metaphorical representation of something significant in this domain? I'm quite curious to understand its origin and significance. Could you explain it in a way that's accessible and understandable, even for those who are not deeply immersed in the intricacies of the crypto world? Your insights would be greatly appreciated.